added gravity function for calculating local g updated config for faster testing and changed the symbols at physical pos

index.js

@@ -14,6 +14,7 @@ const validation = require('./src/helper/validationUtils.js');
 const configUtils = require('./src/helper/configUtils.js');
 const assertions = require('./src/helper/assertionUtils.js')
 const coolprop = require('./src/coolprop-node/src/index.js');
+const gravity = require('./src/helper/gravity.js')
 
 // Domain-specific modules
 const { MeasurementContainer } = require('./src/measurements/index.js');
@@ -44,5 +45,6 @@ module.exports = {
     convert,
     MenuManager,
     childRegistrationUtils,
-    loadCurve
+    loadCurve,
+    gravity
 };